Throw down a war banner within 30 yards that decreases the damage dealt by all enemies within 30 yards of the banner by 10%. Lasts 15 sec.

You can Intervene to your war banner.

Demoralizing Banner is a core warrior ability learned at level 87. With it, warriors can plant a banner on the ground that decreases the damage enemies deal for a short period of time. Warriors can also use [Intervene] on the banner.